JPEG 2000 decoder for DCinema
[libav.git] / libavcodec / jpeg2000dec.c
CommitLineData
c81a7063
NB
1/*
2 * JPEG 2000 image decoder
3 * Copyright (c) 2007 Kamil Nowosad
4 * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * JPEG 2000 image decoder
26 */
27
28#include "libavutil/common.h"
29#include "libavutil/opt.h"
30#include "avcodec.h"
31#include "bytestream.h"
32#include "internal.h"
33#include "jpeg2000.h"
34
35#define JP2_SIG_TYPE 0x6A502020
36#define JP2_SIG_VALUE 0x0D0A870A
37#define JP2_CODESTREAM 0x6A703263
38
39#define HAD_COC 0x01
40#define HAD_QCC 0x02
41
42typedef struct Jpeg2000TilePart {
43 uint16_t tp_idx; // Tile-part index
44 uint8_t tile_index; // Tile index who refers the tile-part
45 uint32_t tp_len; // Length of tile-part
46 const uint8_t *tp_start_bstrm; // Start address bit stream in tile-part
47 const uint8_t *tp_end_bstrm; // End address of the bit stream tile part
48} Jpeg2000TilePart;
49
50/* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
51 * one per component, so tile_part elements have a size of 3 */
52typedef struct Jpeg2000Tile {
53 Jpeg2000Component *comp;
54 uint8_t properties[4];
55 Jpeg2000CodingStyle codsty[4];
56 Jpeg2000QuantStyle qntsty[4];
57 Jpeg2000TilePart tile_part[3];
58} Jpeg2000Tile;
59
60typedef struct Jpeg2000DecoderContext {
61 AVClass *class;
62 AVCodecContext *avctx;
63
64 int width, height;
65 int image_offset_x, image_offset_y;
66 int tile_offset_x, tile_offset_y;
67 uint8_t cbps[4]; // bits per sample in particular components
68 uint8_t sgnd[4]; // if a component is signed
69 uint8_t properties[4];
70 int cdx[4], cdy[4];
71 int precision;
72 int ncomponents;
73 int tile_width, tile_height;
74 int numXtiles, numYtiles;
75 int maxtilelen;
76
77 Jpeg2000CodingStyle codsty[4];
78 Jpeg2000QuantStyle qntsty[4];
79
80 const uint8_t *buf_start;
81 const uint8_t *buf;
82 const uint8_t *buf_end;
83 int bit_index;
84
85 int16_t curtileno;
86 Jpeg2000Tile *tile;
87
88 /*options parameters*/
89 int16_t lowres;
90 int16_t reduction_factor;
91} Jpeg2000DecoderContext;
92
93/* get_bits functions for JPEG2000 packet bitstream
94 * It is a get_bit function with a bit-stuffing routine. If the value of the
95 * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
96 * cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */
97static int get_bits(Jpeg2000DecoderContext *s, int n)
98{
99 int res = 0;
100 if (s->buf_end - s->buf < ((n - s->bit_index) >> 8))
101 return AVERROR(EINVAL);
102 while (--n >= 0) {
103 res <<= 1;
104 if (s->bit_index == 0) {
105 s->bit_index = 7 + (*s->buf != 0xff);
106 s->buf++;
107 }
108 s->bit_index--;
109 res |= (*s->buf >> s->bit_index) & 1;
110 }
111 return res;
112}
113
114static void jpeg2000_flush(Jpeg2000DecoderContext *s)
115{
116 if (*s->buf == 0xff)
117 s->buf++;
118 s->bit_index = 8;
119 s->buf++;
120}
121
122/* decode the value stored in node */
123static int tag_tree_decode(Jpeg2000DecoderContext *s, Jpeg2000TgtNode *node,
124 int threshold)
125{
126 Jpeg2000TgtNode *stack[30];
127 int sp = -1, curval = 0;
128
129 while (node && !node->vis) {
130 stack[++sp] = node;
131 node = node->parent;
132 }
133
134 if (node)
135 curval = node->val;
136 else
137 curval = stack[sp]->val;
138
139 while (curval < threshold && sp >= 0) {
140 if (curval < stack[sp]->val)
141 curval = stack[sp]->val;
142 while (curval < threshold) {
143 int ret;
144 if ((ret = get_bits(s, 1)) > 0) {
145 stack[sp]->vis++;
146 break;
147 } else if (!ret)
148 curval++;
149 else
150 return ret;
151 }
152 stack[sp]->val = curval;
153 sp--;
154 }
155 return curval;
156}
157
158/* marker segments */
159/* get sizes and offsets of image, tiles; number of components */
160static int get_siz(Jpeg2000DecoderContext *s)
161{
162 int i;
163
164 if (s->buf_end - s->buf < 36)
165 return AVERROR(EINVAL);
166
167 s->avctx->profile = bytestream_get_be16(&s->buf); // Rsiz
168 s->width = bytestream_get_be32(&s->buf); // Width
169 s->height = bytestream_get_be32(&s->buf); // Height
170 s->image_offset_x = bytestream_get_be32(&s->buf); // X0Siz
171 s->image_offset_y = bytestream_get_be32(&s->buf); // Y0Siz
172 s->tile_width = bytestream_get_be32(&s->buf); // XTSiz
173 s->tile_height = bytestream_get_be32(&s->buf); // YTSiz
174 s->tile_offset_x = bytestream_get_be32(&s->buf); // XT0Siz
175 s->tile_offset_y = bytestream_get_be32(&s->buf); // YT0Siz
176 s->ncomponents = bytestream_get_be16(&s->buf); // CSiz
177
178 if (s->buf_end - s->buf < 2 * s->ncomponents)
179 return AVERROR(EINVAL);
180
181 for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
182 uint8_t x = bytestream_get_byte(&s->buf);
183 s->cbps[i] = (x & 0x7f) + 1;
184 s->precision = FFMAX(s->cbps[i], s->precision);
185 s->sgnd[i] = (x & 0x80) == 1;
186 s->cdx[i] = bytestream_get_byte(&s->buf);
187 s->cdy[i] = bytestream_get_byte(&s->buf);
188 }
189
190 s->numXtiles = ff_jpeg2000_ceildiv(s->width - s->tile_offset_x, s->tile_width);
191 s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height);
192
193 s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(*s->tile));
194 if (!s->tile)
195 return AVERROR(ENOMEM);
196
197 for (i = 0; i < s->numXtiles * s->numYtiles; i++) {
198 Jpeg2000Tile *tile = s->tile + i;
199
200 tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp));
201 if (!tile->comp)
202 return AVERROR(ENOMEM);
203 }
204
205 /* compute image size with reduction factor */
206 s->avctx->width = ff_jpeg2000_ceildivpow2(s->width - s->image_offset_x,
207 s->reduction_factor);
208 s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
209 s->reduction_factor);
210
211 switch (s->avctx->profile) {
212 case FF_PROFILE_JPEG2000_DCINEMA_2K:
213 case FF_PROFILE_JPEG2000_DCINEMA_4K:
214 /* XYZ color-space for digital cinema profiles */
215 s->avctx->pix_fmt = AV_PIX_FMT_XYZ12LE;
216 break;
217 default:
218 /* For other profiles selects color-space according number of
219 * components and bit depth precision. */
220 switch (s->ncomponents) {
221 case 1:
222 if (s->precision > 8)
223 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
224 else
225 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
226 break;
227 case 3:
228 if (s->precision > 8)
229 s->avctx->pix_fmt = AV_PIX_FMT_RGB48;
230 else
231 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
232 break;
233 case 4:
234 s->avctx->pix_fmt = AV_PIX_FMT_BGRA;
235 break;
236 default:
237 /* pixel format can not be identified */
238 s->avctx->pix_fmt = AV_PIX_FMT_NONE;
239 break;
240 }
241 break;
242 }
243 return 0;
244}
245
246/* get common part for COD and COC segments */
247static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
248{
249 uint8_t byte;
250
251 if (s->buf_end - s->buf < 5)
252 return AVERROR(EINVAL);
253 c->nreslevels = bytestream_get_byte(&s->buf) + 1; // num of resolution levels - 1
254
255 /* compute number of resolution levels to decode */
256 if (c->nreslevels < s->reduction_factor)
257 c->nreslevels2decode = 1;
258 else
259 c->nreslevels2decode = c->nreslevels - s->reduction_factor;
260
261 c->log2_cblk_width = bytestream_get_byte(&s->buf) + 2; // cblk width
262 c->log2_cblk_height = bytestream_get_byte(&s->buf) + 2; // cblk height
263
264 c->cblk_style = bytestream_get_byte(&s->buf);
265 if (c->cblk_style != 0) { // cblk style
266 av_log(s->avctx, AV_LOG_ERROR, "no extra cblk styles supported\n");
267 return -1;
268 }
269 c->transform = bytestream_get_byte(&s->buf); // DWT transformation type
270 /* set integer 9/7 DWT in case of BITEXACT flag */
271 if ((s->avctx->flags & CODEC_FLAG_BITEXACT) && (c->transform == FF_DWT97))
272 c->transform = FF_DWT97_INT;
273
274 if (c->csty & JPEG2000_CSTY_PREC) {
275 int i;
276 for (i = 0; i < c->nreslevels; i++) {
277 byte = bytestream_get_byte(&s->buf);
278 c->log2_prec_widths[i] = byte & 0x0F; // precinct PPx
279 c->log2_prec_heights[i] = (byte >> 4) & 0x0F; // precinct PPy
280 }
281 }
282 return 0;
283}
284
285/* get coding parameters for a particular tile or whole image*/
286static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
287 uint8_t *properties)
288{
289 Jpeg2000CodingStyle tmp;
290 int compno;
291
292 if (s->buf_end - s->buf < 5)
293 return AVERROR(EINVAL);
294
295 tmp.log2_prec_width =
296 tmp.log2_prec_height = 15;
297
298 tmp.csty = bytestream_get_byte(&s->buf);
299
300 // get progression order
301 tmp.prog_order = bytestream_get_byte(&s->buf);
302
303 tmp.nlayers = bytestream_get_be16(&s->buf);
304 tmp.mct = bytestream_get_byte(&s->buf); // multiple component transformation
305
306 get_cox(s, &tmp);
307 for (compno = 0; compno < s->ncomponents; compno++)
308 if (!(properties[compno] & HAD_COC))
309 memcpy(c + compno, &tmp, sizeof(tmp));
310 return 0;
311}
312
313/* Get coding parameters for a component in the whole image or a
314 * particular tile. */
315static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
316 uint8_t *properties)
317{
318 int compno;
319
320 if (s->buf_end - s->buf < 2)
321 return AVERROR(EINVAL);
322
323 compno = bytestream_get_byte(&s->buf);
324
325 c += compno;
326 c->csty = bytestream_get_byte(&s->buf);
327 get_cox(s, c);
328
329 properties[compno] |= HAD_COC;
330 return 0;
331}
332
333/* Get common part for QCD and QCC segments. */
334static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
335{
336 int i, x;
337
338 if (s->buf_end - s->buf < 1)
339 return AVERROR(EINVAL);
340
341 x = bytestream_get_byte(&s->buf); // Sqcd
342
343 q->nguardbits = x >> 5;
344 q->quantsty = x & 0x1f;
345
346 if (q->quantsty == JPEG2000_QSTY_NONE) {
347 n -= 3;
348 if (s->buf_end - s->buf < n)
349 return AVERROR(EINVAL);
350 for (i = 0; i < n; i++)
351 q->expn[i] = bytestream_get_byte(&s->buf) >> 3;
352 } else if (q->quantsty == JPEG2000_QSTY_SI) {
353 if (s->buf_end - s->buf < 2)
354 return AVERROR(EINVAL);
355 x = bytestream_get_be16(&s->buf);
356 q->expn[0] = x >> 11;
357 q->mant[0] = x & 0x7ff;
358 for (i = 1; i < 32 * 3; i++) {
359 int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
360 q->expn[i] = curexpn;
361 q->mant[i] = q->mant[0];
362 }
363 } else {
364 n = (n - 3) >> 1;
365 if (s->buf_end - s->buf < n)
366 return AVERROR(EINVAL);
367 for (i = 0; i < n; i++) {
368 x = bytestream_get_be16(&s->buf);
369 q->expn[i] = x >> 11;
370 q->mant[i] = x & 0x7ff;
371 }
372 }
373 return 0;
374}
375
376/* Get quantization parameters for a particular tile or a whole image. */
377static int get_qcd(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
378 uint8_t *properties)
379{
380 Jpeg2000QuantStyle tmp;
381 int compno;
382
383 if (get_qcx(s, n, &tmp))
384 return -1;
385 for (compno = 0; compno < s->ncomponents; compno++)
386 if (!(properties[compno] & HAD_QCC))
387 memcpy(q + compno, &tmp, sizeof(tmp));
388 return 0;
389}
390
391/* Get quantization parameters for a component in the whole image
392 * on in a particular tile. */
393static int get_qcc(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
394 uint8_t *properties)
395{
396 int compno;
397
398 if (s->buf_end - s->buf < 1)
399 return AVERROR(EINVAL);
400
401 compno = bytestream_get_byte(&s->buf);
402 properties[compno] |= HAD_QCC;
403 return get_qcx(s, n - 1, q + compno);
404}
405
406/* Get start of tile segment. */
407static uint8_t get_sot(Jpeg2000DecoderContext *s, int n)
408{
409 Jpeg2000TilePart *tp;
410 uint16_t Isot;
411 uint32_t Psot;
412 uint8_t TPsot;
413
414 if (s->buf_end - s->buf < 4)
415 return AVERROR(EINVAL);
416
417 Isot = bytestream_get_be16(&s->buf); // Isot
418 if (Isot) {
419 av_log(s->avctx, AV_LOG_ERROR,
420 "Not a DCINEMA JP2K file: more than one tile\n");
421 return -1;
422 }
423 Psot = bytestream_get_be32(&s->buf); // Psot
424 TPsot = bytestream_get_byte(&s->buf); // TPsot
425
426 /* Read TNSot but not used */
427 bytestream_get_byte(&s->buf); // TNsot
428
429 tp = s->tile[s->curtileno].tile_part + TPsot;
430 tp->tile_index = Isot;
431 tp->tp_len = Psot;
432 tp->tp_idx = TPsot;
433
434 /* Start of bit stream. Pointer to SOD marker
435 * Check SOD marker is present. */
436 if (JPEG2000_SOD == bytestream_get_be16(&s->buf))
437 tp->tp_start_bstrm = s->buf;
438 else {
439 av_log(s->avctx, AV_LOG_ERROR, "SOD marker not found \n");
440 return -1;
441 }
442
443 /* End address of bit stream =
444 * start address + (Psot - size of SOT HEADER(n)
445 * - size of SOT MARKER(2) - size of SOD marker(2) */
446 tp->tp_end_bstrm = s->buf + (tp->tp_len - n - 4);
447
448 // set buffer pointer to end of tile part header
449 s->buf = tp->tp_end_bstrm;
450
451 return 0;
452}
453
454/* Tile-part lengths: see ISO 15444-1:2002, section A.7.1
455 * Used to know the number of tile parts and lengths.
456 * There may be multiple TLMs in the header.
457 * TODO: The function is not used for tile-parts management, nor anywhere else.
458 * It can be useful to allocate memory for tile parts, before managing the SOT
459 * markers. Parsing the TLM header is needed to increment the input header
460 * buffer.
461 * This marker is mandatory for DCI. */
462static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
463{
464 uint8_t Stlm, ST, SP, tile_tlm, i;
465 bytestream_get_byte(&s->buf); /* Ztlm: skipped */
466 Stlm = bytestream_get_byte(&s->buf);
467
468 // too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02);
469 ST = (Stlm >> 4) & 0x03;
470 // TODO: Manage case of ST = 0b11 --> raise error
471 SP = (Stlm >> 6) & 0x01;
472 tile_tlm = (n - 4) / ((SP + 1) * 2 + ST);
473 for (i = 0; i < tile_tlm; i++) {
474 switch (ST) {
475 case 0:
476 break;
477 case 1:
478 bytestream_get_byte(&s->buf);
479 break;
480 case 2:
481 bytestream_get_be16(&s->buf);
482 break;
483 case 3:
484 bytestream_get_be32(&s->buf);
485 break;
486 }
487 if (SP == 0) {
488 bytestream_get_be16(&s->buf);
489 } else {
490 bytestream_get_be32(&s->buf);
491 }
492 }
493 return 0;
494}
495
496static int init_tile(Jpeg2000DecoderContext *s, int tileno)
497{
498 int compno;
499 int tilex = tileno % s->numXtiles;
500 int tiley = tileno / s->numXtiles;
501 Jpeg2000Tile *tile = s->tile + tileno;
502 Jpeg2000CodingStyle *codsty;
503 Jpeg2000QuantStyle *qntsty;
504
505 if (!tile->comp)
506 return AVERROR(ENOMEM);
507
508 /* copy codsty, qnsty to tile. TODO: Is it the best way?
509 * codsty, qnsty is an array of 4 structs Jpeg2000CodingStyle
510 * and Jpeg2000QuantStyle */
511 memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(*codsty));
512 memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(*qntsty));
513
514 for (compno = 0; compno < s->ncomponents; compno++) {
515 Jpeg2000Component *comp = tile->comp + compno;
516 int ret; // global bandno
517 codsty = tile->codsty + compno;
518 qntsty = tile->qntsty + compno;
519
520 comp->coord_o[0][0] = FFMAX(tilex * s->tile_width + s->tile_offset_x, s->image_offset_x);
521 comp->coord_o[0][1] = FFMIN((tilex + 1) * s->tile_width + s->tile_offset_x, s->width);
522 comp->coord_o[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y);
523 comp->coord_o[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height);
524
525 // FIXME: add a dcinema profile check ?
526 // value is guaranteed by profile (orig=0, 1 tile)
527 comp->coord[0][0] = 0;
528 comp->coord[0][1] = s->avctx->width;
529 comp->coord[1][0] = 0;
530 comp->coord[1][1] = s->avctx->height;
531
532 if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty,
533 s->cbps[compno], s->cdx[compno],
534 s->cdy[compno], s->avctx))
535 return ret;
536 }
537 return 0;
538}
539
540/* Read the number of coding passes. */
541static int getnpasses(Jpeg2000DecoderContext *s)
542{
543 int num;
544 if (!get_bits(s, 1))
545 return 1;
546 if (!get_bits(s, 1))
547 return 2;
548 if ((num = get_bits(s, 2)) != 3)
549 return num < 0 ? num : 3 + num;
550 if ((num = get_bits(s, 5)) != 31)
551 return num < 0 ? num : 6 + num;
552 num = get_bits(s, 7);
553 return num < 0 ? num : 37 + num;
554}
555
556static int getlblockinc(Jpeg2000DecoderContext *s)
557{
558 int res = 0, ret;
559 while (ret = get_bits(s, 1)) {
560 if (ret < 0)
561 return ret;
562 res++;
563 }
564 return res;
565}
566
567static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
568 Jpeg2000CodingStyle *codsty,
569 Jpeg2000ResLevel *rlevel, int precno,
570 int layno, uint8_t *expn, int numgbits)
571{
572 int bandno, cblkno, ret, nb_code_blocks;
573
574 if (!(ret = get_bits(s, 1))) {
575 jpeg2000_flush(s);
576 return 0;
577 } else if (ret < 0)
578 return ret;
579
580 for (bandno = 0; bandno < rlevel->nbands; bandno++) {
581 Jpeg2000Band *band = rlevel->band + bandno;
582 Jpeg2000Prec *prec = band->prec + precno;
583
584 if (band->coord[0][0] == band->coord[0][1] ||
585 band->coord[1][0] == band->coord[1][1])
586 continue;
587 prec->yi0 = 0;
588 prec->xi0 = 0;
589 nb_code_blocks = prec->nb_codeblocks_height *
590 prec->nb_codeblocks_width;
591 for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
592 Jpeg2000Cblk *cblk = prec->cblk + cblkno;
593 int incl, newpasses, llen;
594
595 if (cblk->npasses)
596 incl = get_bits(s, 1);
597 else
598 incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno;
599 if (!incl)
600 continue;
601 else if (incl < 0)
602 return incl;
603
604 if (!cblk->npasses)
605 cblk->nonzerobits = expn[bandno] + numgbits - 1 -
606 tag_tree_decode(s, prec->zerobits + cblkno,
607 100);
608 if ((newpasses = getnpasses(s)) < 0)
609 return newpasses;
610 if ((llen = getlblockinc(s)) < 0)
611 return llen;
612 cblk->lblock += llen;
613 if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0)
614 return ret;
615 cblk->lengthinc = ret;
616 cblk->npasses += newpasses;
617 }
618 }
619 jpeg2000_flush(s);
620
621 if (codsty->csty & JPEG2000_CSTY_EPH) {
622 if (AV_RB16(s->buf) == JPEG2000_EPH)
623 s->buf += 2;
624 else
625 av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
626 }
627
628 for (bandno = 0; bandno < rlevel->nbands; bandno++) {
629 Jpeg2000Band *band = rlevel->band + bandno;
630 Jpeg2000Prec *prec = band->prec + precno;
631
632 nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width;
633 for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
634 Jpeg2000Cblk *cblk = prec->cblk + cblkno;
635 if (s->buf_end - s->buf < cblk->lengthinc)
636 return AVERROR(EINVAL);
637 bytestream_get_buffer(&s->buf, cblk->data, cblk->lengthinc);
638 cblk->length += cblk->lengthinc;
639 cblk->lengthinc = 0;
640 }
641 }
642 return 0;
643}
644
645static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
646{
647 int layno, reslevelno, compno, precno, ok_reslevel;
648 uint8_t prog_order = tile->codsty[0].prog_order;
649 uint16_t x;
650 uint16_t y;
651
652 s->bit_index = 8;
653 switch (prog_order) {
654 case JPEG2000_PGOD_LRCP:
655 for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
656 ok_reslevel = 1;
657 for (reslevelno = 0; ok_reslevel; reslevelno++) {
658 ok_reslevel = 0;
659 for (compno = 0; compno < s->ncomponents; compno++) {
660 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
661 Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
662 if (reslevelno < codsty->nreslevels) {
663 Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
664 reslevelno;
665 ok_reslevel = 1;
666 for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
667 if (jpeg2000_decode_packet(s,
668 codsty, rlevel,
669 precno, layno,
670 qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
671 qntsty->nguardbits))
672 return -1;
673 }
674 }
675 }
676 }
677 break;
678
679 case JPEG2000_PGOD_CPRL:
680 for (compno = 0; compno < s->ncomponents; compno++) {
681 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
682 Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
683
684 /* Set bit stream buffer address according to tile-part.
685 * For DCinema one tile-part per component, so can be
686 * indexed by component. */
687 s->buf = tile->tile_part[compno].tp_start_bstrm;
688
689 /* Position loop (y axis)
690 * TODO: Automate computing of step 256.
691 * Fixed here, but to be computed before entering here. */
692 for (y = 0; y < s->height; y += 256) {
693 /* Position loop (y axis)
694 * TODO: automate computing of step 256.
695 * Fixed here, but to be computed before entering here. */
696 for (x = 0; x < s->width; x += 256) {
697 for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
698 uint16_t prcx, prcy;
699 uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
700 Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
701
702 if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) ||
703 (y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
704 continue;
705
706 if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) ||
707 (x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
708 continue;
709
710 // check if a precinct exists
711 prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
712 prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
713 precno = prcx + rlevel->num_precincts_x * prcy;
714 for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
715 if (jpeg2000_decode_packet(s, codsty, rlevel,
716 precno, layno,
717 qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
718 qntsty->nguardbits))
719 return -1;
720 }
721 }
722 }
723 }
724 }
725 break;
726
727 default:
728 break;
729 }
730
731 /* EOC marker reached */
732 s->buf += 2;
733
734 return 0;
735}
736
737/* TIER-1 routines */
738static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
739 int bpno, int bandno)
740{
741 int mask = 3 << (bpno - 1), y0, x, y;
742
743 for (y0 = 0; y0 < height; y0 += 4)
744 for (x = 0; x < width; x++)
745 for (y = y0; y < height && y < y0 + 4; y++)
746 if ((t1->flags[y + 1][x + 1] & JPEG2000_T1_SIG_NB)
747 && !(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
748 if (ff_mqc_decode(&t1->mqc,
749 t1->mqc.cx_states +
750 ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
751 bandno))) {
752 int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
753 &xorbit);
754
755 t1->data[y][x] =
756 (ff_mqc_decode(&t1->mqc,
757 t1->mqc.cx_states + ctxno) ^ xorbit)
758 ? -mask : mask;
759
760 ff_jpeg2000_set_significance(t1, x, y,
761 t1->data[y][x] < 0);
762 }
763 t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS;
764 }
765}
766
767static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
768 int bpno)
769{
770 int phalf, nhalf;
771 int y0, x, y;
772
773 phalf = 1 << (bpno - 1);
774 nhalf = -phalf;
775
776 for (y0 = 0; y0 < height; y0 += 4)
777 for (x = 0; x < width; x++)
778 for (y = y0; y < height && y < y0 + 4; y++)
779 if ((t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) {
780 int ctxno = ff_jpeg2000_getrefctxno(t1->flags[y + 1][x + 1]);
781 int r = ff_mqc_decode(&t1->mqc,
782 t1->mqc.cx_states + ctxno)
783 ? phalf : nhalf;
784 t1->data[y][x] += t1->data[y][x] < 0 ? -r : r;
785 t1->flags[y + 1][x + 1] |= JPEG2000_T1_REF;
786 }
787}
788
789static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
790 int width, int height, int bpno, int bandno,
791 int seg_symbols)
792{
793 int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
794
795 for (y0 = 0; y0 < height; y0 += 4)
796 for (x = 0; x < width; x++) {
797 if (y0 + 3 < height &&
798 !((t1->flags[y0 + 1][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
799 (t1->flags[y0 + 2][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
800 (t1->flags[y0 + 3][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
801 (t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)))) {
802 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
803 continue;
804 runlen = ff_mqc_decode(&t1->mqc,
805 t1->mqc.cx_states + MQC_CX_UNI);
806 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc,
807 t1->mqc.cx_states +
808 MQC_CX_UNI);
809 dec = 1;
810 } else {
811 runlen = 0;
812 dec = 0;
813 }
814
815 for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
816 if (!dec) {
817 if (!(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)))
818 dec = ff_mqc_decode(&t1->mqc,
819 t1->mqc.cx_states +
820 ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
821 bandno));
822 }
823 if (dec) {
824 int xorbit;
825 int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
826 &xorbit);
827 t1->data[y][x] = (ff_mqc_decode(&t1->mqc,
828 t1->mqc.cx_states + ctxno) ^
829 xorbit)
830 ? -mask : mask;
831 ff_jpeg2000_set_significance(t1, x, y, t1->data[y][x] < 0);
832 }
833 dec = 0;
834 t1->flags[y + 1][x + 1] &= ~JPEG2000_T1_VIS;
835 }
836 }
837 if (seg_symbols) {
838 int val;
839 val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
840 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
841 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
842 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
843 if (val != 0xa)
844 av_log(s->avctx, AV_LOG_ERROR,
845 "Segmentation symbol value incorrect\n");
846 }
847}
848
849static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
850 Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk,
851 int width, int height, int bandpos)
852{
853 int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y;
854
855 for (y = 0; y < height + 2; y++)
856 memset(t1->flags[y], 0, (width + 2) * sizeof(width));
857
858 for (y = 0; y < height; y++)
859 memset(t1->data[y], 0, width * sizeof(width));
860
861 ff_mqc_initdec(&t1->mqc, cblk->data);
862 cblk->data[cblk->length] = 0xff;
863 cblk->data[cblk->length + 1] = 0xff;
864
865 while (passno--) {
866 switch (pass_t) {
867 case 0:
868 decode_sigpass(t1, width, height, bpno + 1, bandpos);
869 break;
870 case 1:
871 decode_refpass(t1, width, height, bpno + 1);
872 break;
873 case 2:
874 decode_clnpass(s, t1, width, height, bpno + 1, bandpos,
875 codsty->cblk_style & JPEG2000_CBLK_SEGSYM);
876 break;
877 }
878
879 pass_t++;
880 if (pass_t == 3) {
881 bpno--;
882 pass_t = 0;
883 }
884 }
885 return 0;
886}
887
888/* TODO: Verify dequantization for lossless case
889 * comp->data can be float or int
890 * band->stepsize can be float or int
891 * depending on the type of DWT transformation.
892 * see ISO/IEC 15444-1:2002 A.6.1 */
893
894/* Float dequantization of a codeblock.*/
895static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
896 Jpeg2000Component *comp,
897 Jpeg2000T1Context *t1, Jpeg2000Band *band)
898{
899 int i, j, idx;
900 float *datap = &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
901 for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
902 for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
903 idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
904 datap[idx] = (float)(t1->data[j][i]) * ((float)band->stepsize);
905 }
906 return;
907}
908
909/* Integer dequantization of a codeblock.*/
910static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
911 Jpeg2000Component *comp,
912 Jpeg2000T1Context *t1, Jpeg2000Band *band)
913{
914 int i, j, idx;
915 int32_t *datap =
916 (int32_t *) &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
917 for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
918 for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
919 idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
920 datap[idx] =
921 ((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
922 }
923 return;
924}
925
926/* Inverse ICT parameters in float and integer.
927 * int value = (float value) * (1<<16) */
928static const float f_ict_params[4] = {
929 1.402f,
930 0.34413f,
931 0.71414f,
932 1.772f
933};
934static const int i_ict_params[4] = {
935 91881,
936 22553,
937 46802,
938 116130
939};
940
941static int mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
942{
943 int i, csize = 1;
944 int ret = 0;
945 int32_t *src[3], i0, i1, i2;
946 float *srcf[3], i0f, i1f, i2f;
947
948 for (i = 0; i < 3; i++)
949 if (tile->codsty[0].transform == FF_DWT97)
950 srcf[i] = tile->comp[i].data;
951 else
952 src[i] = (int32_t *)tile->comp[i].data;
953
954 for (i = 0; i < 2; i++)
955 csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
956 switch (tile->codsty[0].transform) {
957 case FF_DWT97:
958 for (i = 0; i < csize; i++) {
959 i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
960 i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
961 - (f_ict_params[2] * *srcf[2]);
962 i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
963 *srcf[0]++ = i0f;
964 *srcf[1]++ = i1f;
965 *srcf[2]++ = i2f;
966 }
967 break;
968 case FF_DWT97_INT:
969 for (i = 0; i < csize; i++) {
970 i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
971 i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
972 - (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
973 i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
974 *src[0]++ = i0;
975 *src[1]++ = i1;
976 *src[2]++ = i2;
977 }
978 break;
979 case FF_DWT53:
980 for (i = 0; i < csize; i++) {
981 i1 = *src[0] - (*src[2] + *src[1] >> 2);
982 i0 = i1 + *src[2];
983 i2 = i1 + *src[1];
984 *src[0]++ = i0;
985 *src[1]++ = i1;
986 *src[2]++ = i2;
987 }
988 break;
989 }
990 return ret;
991}
992
993static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
994 AVFrame *picture)
995{
996 int compno, reslevelno, bandno;
997 int x, y;
998
999 uint8_t *line;
1000 Jpeg2000T1Context t1;
1001 /* Loop on tile components */
1002
1003 for (compno = 0; compno < s->ncomponents; compno++) {
1004 Jpeg2000Component *comp = tile->comp + compno;
1005 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1006 /* Loop on resolution levels */
1007 for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
1008 Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1009 /* Loop on bands */
1010 for (bandno = 0; bandno < rlevel->nbands; bandno++) {
1011 uint16_t nb_precincts, precno;
1012 Jpeg2000Band *band = rlevel->band + bandno;
1013 int cblkno = 0, bandpos;
1014 bandpos = bandno + (reslevelno > 0);
1015
1016 nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
1017 /* Loop on precincts */
1018 for (precno = 0; precno < nb_precincts; precno++) {
1019 Jpeg2000Prec *prec = band->prec + precno;
1020
1021 /* Loop on codeblocks */
1022 for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
1023 int x, y;
1024 Jpeg2000Cblk *cblk = prec->cblk + cblkno;
1025 decode_cblk(s, codsty, &t1, cblk,
1026 cblk->coord[0][1] - cblk->coord[0][0],
1027 cblk->coord[1][1] - cblk->coord[1][0],
1028 bandpos);
1029
1030 /* Manage band offsets */
1031 x = cblk->coord[0][0];
1032 y = cblk->coord[1][0];
1033 if ((reslevelno > 0) && ((bandno + 1) & 1)) {
1034 Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1035 x += pres->coord[0][1] - pres->coord[0][0];
1036 }
1037 if ((reslevelno > 0) && ((bandno + 1) & 2)) {
1038 Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1039 y += pres->coord[1][1] - pres->coord[1][0];
1040 }
1041
1042 if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1043 dequantization_int(x, y, cblk, comp, &t1, band);
1044 else
1045 dequantization_float(x, y, cblk, comp, &t1, band);
1046 } /* end cblk */
1047 } /*end prec */
1048 } /* end band */
1049 } /* end reslevel */
1050
1051 /* inverse DWT */
1052 ff_dwt_decode(&comp->dwt, comp->data);
1053 } /*end comp */
1054
1055 /* inverse MCT transformation */
1056 if (tile->codsty[0].mct)
1057 mct_decode(s, tile);
1058
1059 if (s->avctx->pix_fmt == PIX_FMT_BGRA) // RGBA -> BGRA
1060 FFSWAP(float *, tile->comp[0].data, tile->comp[2].data);
1061
1062 if (s->precision <= 8) {
1063 for (compno = 0; compno < s->ncomponents; compno++) {
1064 Jpeg2000Component *comp = tile->comp + compno;
1065 int32_t *datap = (int32_t *)comp->data;
1066 y = tile->comp[compno].coord[1][0] - s->image_offset_y;
1067 line = picture->data[0] + y * picture->linesize[0];
1068 for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1069 uint8_t *dst;
1070
1071 x = tile->comp[compno].coord[0][0] - s->image_offset_x;
1072 dst = line + x * s->ncomponents + compno;
1073
1074 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
1075 *datap += 1 << (s->cbps[compno] - 1);
1076 if (*datap < 0)
1077 *datap = 0;
1078 else if (*datap >= (1 << s->cbps[compno]))
1079 *datap = (1 << s->cbps[compno]) - 1;
1080 *dst = *datap++;
1081 dst += s->ncomponents;
1082 }
1083 line += picture->linesize[0];
1084 }
1085 }
1086 } else {
1087 for (compno = 0; compno < s->ncomponents; compno++) {
1088 Jpeg2000Component *comp = tile->comp + compno;
1089 float *datap = comp->data;
1090 int32_t *i_datap = (int32_t *) comp->data;
1091 uint16_t *linel;
1092
1093 y = tile->comp[compno].coord[1][0] - s->image_offset_y;
1094 linel = (uint16_t *)picture->data[0] + y * (picture->linesize[0] >> 1);
1095 for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1096 uint16_t *dst;
1097 x = tile->comp[compno].coord[0][0] - s->image_offset_x;
1098 dst = linel + (x * s->ncomponents + compno);
1099 for (; x < s->avctx->width; x += s->cdx[compno]) {
1100 int16_t val;
1101 /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
1102 if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1103 val = *i_datap + (1 << (s->cbps[compno] - 1));
1104 else
1105 val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
1106 val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
1107 /* align 12 bit values in little-endian mode */
1108 *dst = val << 4;
1109 datap++;
1110 i_datap++;
1111 dst += s->ncomponents;
1112 }
1113 linel += picture->linesize[0] >> 1;
1114 }
1115 }
1116 }
1117 return 0;
1118}
1119
1120static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s)
1121{
1122 int tileno, compno;
1123 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
1124 for (compno = 0; compno < s->ncomponents; compno++) {
1125 Jpeg2000Component *comp = s->tile[tileno].comp + compno;
1126 Jpeg2000CodingStyle *codsty = s->tile[tileno].codsty + compno;
1127
1128 ff_jpeg2000_cleanup(comp, codsty);
1129 }
1130 av_freep(&s->tile[tileno].comp);
1131 }
1132 av_freep(&s->tile);
1133}
1134
1135static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
1136{
1137 Jpeg2000CodingStyle *codsty = s->codsty;
1138 Jpeg2000QuantStyle *qntsty = s->qntsty;
1139 uint8_t *properties = s->properties;
1140
1141 for (;;) {
1142 int len, ret = 0;
1143 uint16_t marker;
1144 const uint8_t *oldbuf;
1145
1146 if (s->buf_end - s->buf < 2) {
1147 av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
1148 break;
1149 }
1150
1151 marker = bytestream_get_be16(&s->buf);
1152 oldbuf = s->buf;
1153
1154 if (marker == JPEG2000_EOC)
1155 break;
1156
1157 if (s->buf_end - s->buf < 2)
1158 return AVERROR(EINVAL);
1159 len = bytestream_get_be16(&s->buf);
1160 switch (marker) {
1161 case JPEG2000_SIZ:
1162 ret = get_siz(s);
1163 break;
1164 case JPEG2000_COC:
1165 ret = get_coc(s, codsty, properties);
1166 break;
1167 case JPEG2000_COD:
1168 ret = get_cod(s, codsty, properties);
1169 break;
1170 case JPEG2000_QCC:
1171 ret = get_qcc(s, len, qntsty, properties);
1172 break;
1173 case JPEG2000_QCD:
1174 ret = get_qcd(s, len, qntsty, properties);
1175 break;
1176 case JPEG2000_SOT:
1177 ret = get_sot(s, len);
1178 break;
1179 case JPEG2000_COM:
1180 // the comment is ignored
1181 s->buf += len - 2;
1182 break;
1183 case JPEG2000_TLM:
1184 // Tile-part lengths
1185 ret = get_tlm(s, len);
1186 break;
1187 default:
1188 av_log(s->avctx, AV_LOG_ERROR,
1189 "unsupported marker 0x%.4X at pos 0x%lX\n",
1190 marker, (uint64_t)(s->buf - s->buf_start - 4));
1191 s->buf += len - 2;
1192 break;
1193 }
1194 if (((s->buf - oldbuf != len) && (marker != JPEG2000_SOT)) || ret) {
1195 av_log(s->avctx, AV_LOG_ERROR,
1196 "error during processing marker segment %.4x\n", marker);
1197 return ret ? ret : -1;
1198 }
1199 }
1200 return 0;
1201}
1202
1203/* Read bit stream packets --> T2 operation. */
1204static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s)
1205{
1206 int ret = 0;
1207 Jpeg2000Tile *tile = s->tile + s->curtileno;
1208
1209 if (ret = init_tile(s, s->curtileno))
1210 return ret;
1211 if (ret = jpeg2000_decode_packets(s, tile))
1212 return ret;
1213
1214 return 0;
1215}
1216
1217static int jp2_find_codestream(Jpeg2000DecoderContext *s)
1218{
1219 int32_t atom_size;
1220 int found_codestream = 0, search_range = 10;
1221
1222 // Skip JPEG 2000 signature atom.
1223 s->buf += 12;
1224
1225 while (!found_codestream && search_range) {
1226 atom_size = AV_RB32(s->buf);
1227 if (AV_RB32(s->buf + 4) == JP2_CODESTREAM) {
1228 found_codestream = 1;
1229 s->buf += 8;
1230 } else {
1231 s->buf += atom_size;
1232 search_range--;
1233 }
1234 }
1235
1236 if (found_codestream)
1237 return 1;
1238 return 0;
1239}
1240
1241static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
1242 int *got_frame, AVPacket *avpkt)
1243{
1244 Jpeg2000DecoderContext *s = avctx->priv_data;
1245 AVFrame *picture = data;
1246 int tileno, ret;
1247
1248 s->avctx = avctx;
1249 s->buf = s->buf_start = avpkt->data;
1250 s->buf_end = s->buf_start + avpkt->size;
1251 s->curtileno = 0; // TODO: only one tile in DCI JP2K. to implement for more tiles
1252
1253 // reduction factor, i.e number of resolution levels to skip
1254 s->reduction_factor = s->lowres;
1255
1256 ff_jpeg2000_init_tier1_luts();
1257
1258 if (s->buf_end - s->buf < 2)
1259 return AVERROR(EINVAL);
1260
1261 // check if the image is in jp2 format
1262 if ((AV_RB32(s->buf) == 12) &&
1263 (AV_RB32(s->buf + 4) == JP2_SIG_TYPE) &&
1264 (AV_RB32(s->buf + 8) == JP2_SIG_VALUE)) {
1265 if (!jp2_find_codestream(s)) {
1266 av_log(avctx, AV_LOG_ERROR,
1267 "couldn't find jpeg2k codestream atom\n");
1268 return -1;
1269 }
1270 }
1271
1272 if (bytestream_get_be16(&s->buf) != JPEG2000_SOC) {
1273 av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
1274 return -1;
1275 }
1276 if (ret = jpeg2000_read_main_headers(s))
1277 return ret;
1278
1279 /* get picture buffer */
1280 if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
1281 av_log(avctx, AV_LOG_ERROR, "ff_get_buffer() failed\n");
1282 return ret;
1283 }
1284 picture->pict_type = AV_PICTURE_TYPE_I;
1285 picture->key_frame = 1;
1286
1287 if (ret = jpeg2000_read_bitstream_packets(s))
1288 return ret;
1289 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
1290 if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture))
1291 return ret;
1292 jpeg2000_dec_cleanup(s);
1293
1294 *got_frame = 1;
1295
1296 return s->buf - s->buf_start;
1297}
1298
1299#define OFFSET(x) offsetof(Jpeg2000DecoderContext, x)
1300#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1301
1302static const AVOption options[] = {
1303 { "lowres", "Lower the decoding resolution by a power of two",
1304 OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD },
1305 { NULL },
1306};
1307
1308static const AVProfile profiles[] = {
1309 { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0, "JPEG 2000 codestream restriction 0" },
1310 { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1, "JPEG 2000 codestream restriction 1" },
1311 { FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION, "JPEG 2000 no codestream restrictions" },
1312 { FF_PROFILE_JPEG2000_DCINEMA_2K, "JPEG 2000 digital cinema 2K" },
1313 { FF_PROFILE_JPEG2000_DCINEMA_4K, "JPEG 2000 digital cinema 4K" },
1314 { FF_PROFILE_UNKNOWN },
1315};
1316
1317static const AVClass class = {
1318 .class_name = "jpeg2000",
1319 .item_name = av_default_item_name,
1320 .option = options,
1321 .version = LIBAVUTIL_VERSION_INT,
1322};
1323
1324AVCodec ff_jpeg2000_decoder = {
1325 .name = "jpeg2000",
1326 .long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"),
1327 .type = AVMEDIA_TYPE_VIDEO,
1328 .id = AV_CODEC_ID_JPEG2000,
1329 .priv_data_size = sizeof(Jpeg2000DecoderContext),
1330 .decode = jpeg2000_decode_frame,
1331 .priv_class = &class,
1332 .pix_fmts = (enum PixelFormat[]) { AV_PIX_FMT_XYZ12,
1333 AV_PIX_FMT_GRAY8,
1334 -1 },
1335 .profiles = NULL_IF_CONFIG_SMALL(profiles)
1336};